The DeWalt 20V Max Green Rotary Tough Laser uses green beam technology, which is said to provide additional visibility in bright environments compared with traditional red beams. The dual-slope laser (+/- 10%) features debris and water resistance and has a 2-meter drop protection. The laser provides accuracy of +/- 1/16 inches at 100 feet and an interior range of 250 feet or an exterior range of 2,000 feet with the use of a detector. The laser operates with a 20-volt battery for longer use. dewalt.com